My husband loves key lime pie, but the filling is rich with all those egg yolks and sweetened condensed milk and he is not really into rich foods. One Saturday I was watching an episode of Everyday Baking on PBS which featured a recipe for Lime Squares with Pistachio-Graham Crust. They looked good, and with less of the lime filling I thought they would be perfect for my husband. First, the nuts had to go. Next, I added some...